From: "Matt Boiteau mattboiteau@gmail.com" <flyrotary@lancaironline.net>
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Date: Wed, 08 Jan 2020 20:02:11 -0500
Message-ID: <339fda9f-cf38-4009-af31-5520813e81a7@getmailbird.com>
Subject: Re: [FlyRotary] Re: Using the EM3's EGT/CHT inputs for reading  MPX10
 pressure sensors
To: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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What kind of pressure numbers do we think will show? =C2=A00-40kPa? Wonderi=
ng what scale sensors would work. Found some cheap Ebays.

https://www.ebay.com/itm/1pcs-3-3-5V-Digital-Barometric-Air-Pressure-Sensor=
-Module-for-Arduino-3-3V-5V/184086875631?hash=3Ditem2adc6ecdef:g:IgEAAOSwRg=
9d-ejY [https://www.ebay.com/itm/1pcs-3-3-5V-Digital-Barometric-Air-Pressur=
e-Sensor-Module-for-Arduino-3-3V-5V/184086875631?hash=3Ditem2adc6ecdef:g:Ig=
EAAOSwRg9d-ejY]

- Matt Boiteau
On 2020-01-08 7:07:36 PM, Stephen Izett stephen.izett@gmail.com <flyrotary@=
lancaironline.net> wrote:
Thanks very much Finn

Thats what I was a after.
As you mention, I=E2=80=99m not needing hi res data to understand whats hap=
pening in the cowl and ducts at various speeds.
Unfortunately I removed the data log option years ago (not enough space in =
that panel) and the Skyview logs the engine data well.

Do you have the schematics for the EC2 and 3? & EM3?

I thought it was just a question of whether I wanted to spend the extra tim=
e knocking up a string of amps for the 5 sensors I=E2=80=99ve got.
But after thinking about it overnight, displaying the data in the cockpit i=
s no where near as helpful as logging and analysing the data on the ground.
I use a micromite system so the reading and writing to a mem card will be s=
imple.
The benefit of building a little batt powered unit as you suggested Matt is=
 we could use it to diagnose other=E2=80=99s temp issues.

So you guys have been helpful as usual.
With my 5 MPX10DP sensors we could log airspeed and 4 pressure inputs refer=
enced to the ships static.
Perhaps temps for each press input would be helpful as Matt suggested.

Being realistic, I=E2=80=99m a bit slow, so I would need a week to fab it a=
ll up.
But it would be super helpful to me and possibly many others.
Only over the weekend we had a first flight of a lyc powered machine put do=
wn in a field adjacent to our strip due to overheating. Fortunately both pi=
lot and machine were unscathed.

Cheers

Steve Izett


> On 8 Jan 2020, at 11:58 pm, Finn Lassen finn.lassen@verizon.net wrote:
>
> I thought about 3D printing a pressure multiplexer to be driven by a step=
per motor.
>
> Imagine an 8 point ignition distributor.
>
> You wouldn't have 8 real time pressure sensors, but I guess 1 second on e=
ach input should be enough for pressure to stabilize enough for measurement=
. So sampling all 8 inputs would take 8 seconds.
>
> Commercially available but much more expensive than buying 7 extra sensor=
s.
>
> Should be a fun Arduino project.
>
> Finn
>
> On 1/8/2020 10:17 AM, Matt Boiteau mattboiteau@gmail.com wrote:
>> Temp sensors are cheap, but pressure sensors are $15-20??each.
>
>


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Homepage: http://www.flyrotary.com/
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<body><div id=3D"__MailbirdStyleContent" style=3D"font-size: 10pt;font-fami=
ly: Arial;color: #000000">
                                        What kind of pressure numbers do we=
 think will show? &nbsp;0-40kPa? Wondering what scale sensors would work. F=
ound some cheap Ebays.<br><br><a href=3D"https://www.ebay.com/itm/1pcs-3-3-=
5V-Digital-Barometric-Air-Pressure-Sensor-Module-for-Arduino-3-3V-5V/184086=
875631?hash=3Ditem2adc6ecdef:g:IgEAAOSwRg9d-ejY">https://www.ebay.com/itm/1=
pcs-3-3-5V-Digital-Barometric-Air-Pressure-Sensor-Module-for-Arduino-3-3V-5=
V/184086875631?hash=3Ditem2adc6ecdef:g:IgEAAOSwRg9d-ejY</a><div><br></div><=
div class=3D"mb_sig">- Matt Boiteau</div><blockquote class=3D"history_conta=
iner" type=3D"cite" style=3D"border-left-style:solid;border-width:1px; marg=
in-top:20px; margin-left:0px;padding-left:10px;">
                        <p style=3D"color: #AAAAAA; margin-top: 10px;">On 2=
020-01-08 7:07:36 PM, Stephen Izett stephen.izett@gmail.com &lt;flyrotary@l=
ancaironline.net&gt; wrote:</p><div style=3D"font-family:Arial,Helvetica,sa=
ns-serif">Thanks very much Finn=0D<br>=0D<br>Thats what I was a after.=0D<b=
r>As you mention, I=E2=80=99m not needing hi res data to understand whats h=
appening in the cowl and ducts at various speeds.=0D<br>Unfortunately I rem=
oved the data log option years ago (not enough space in that panel) and the=
 Skyview logs the engine data well.=0D<br>=0D<br>Do you have the schematics=
 for the EC2 and 3? & EM3?=0D<br>=0D<br>I thought it was just a question of=
 whether I wanted to spend the extra time knocking up a string of amps for =
the 5 sensors I=E2=80=99ve got.=0D<br>But after thinking about it overnight=
, displaying the data in the cockpit is no where near as helpful as logging=
 and analysing the data on the ground. =0D<br>I use a micromite system so t=
he reading and writing to a mem card will be simple.=0D<br>The benefit of b=
uilding a little batt powered unit as you suggested Matt is we could use it=
 to diagnose other=E2=80=99s temp issues.=0D<br>=0D<br>So you guys have bee=
n helpful as usual.=0D<br>With my 5 MPX10DP sensors we could log airspeed a=
nd 4 pressure inputs referenced to the ships static.=0D<br>Perhaps temps fo=
r each press input would be helpful as Matt suggested.=0D<br>=0D<br>Being r=
ealistic, I=E2=80=99m a bit slow, so I would need a week to fab it all up.=
=0D<br>But it would be super helpful to me and possibly many others.=0D<br>=
Only over the weekend we had a first flight of a lyc powered machine put do=
wn in a field adjacent to our strip due to overheating. Fortunately both pi=
lot and machine were unscathed.=0D<br>=0D<br>Cheers=0D<br>=0D<br>Steve Izet=
t=0D<br>=0D<br>=0D<br>=0D<br>=0D<br>=0D<br>=0D<br>=0D<br>=0D<br>> On 8 Jan =
2020, at 11:58 pm, Finn Lassen finn.lassen@verizon.net <flyrotary@lancairon=
line.net> wrote:=0D<br>> =0D<br>> I thought about 3D printing a pressure mu=
ltiplexer to be driven by a stepper motor.=0D<br>> =0D<br>> Imagine an 8 po=
int ignition distributor.=0D<br>> =0D<br>> You wouldn't have 8 real time pr=
essure sensors, but I guess 1 second on each input should be enough for pre=
ssure to stabilize enough for measurement. So sampling all 8 inputs would t=
ake 8 seconds.=0D<br>> =0D<br>> Commercially available but much more expens=
ive than buying 7 extra sensors.=0D<br>> =0D<br>> Should be a fun Arduino p=
roject.=0D<br>> =0D<br>> Finn=0D<br>> =0D<br>> On 1/8/2020 10:17 AM, Matt B=
oiteau mattboiteau@gmail.com wrote:=0D<br>>> Temp sensors are cheap, but pr=
essure sensors are $15-20??each.=0D<br>> =0D<br>> =0D<br>=0D<br>=0D<br>--=
=0D<br>Homepage:  http://www.flyrotary.com/=0D<br>Archive and UnSub:   http=
://mail.lancaironline.net:81/lists/flyrotary/List.html=0D<br></flyrotary@la=
ncaironline.net></div></blockquote>
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